JP2006243729A - Overdrive system and overdrive method - Google Patents

Overdrive system and overdrive method Download PDF

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JP2006243729A
JP2006243729A JP2006052944A JP2006052944A JP2006243729A JP 2006243729 A JP2006243729 A JP 2006243729A JP 2006052944 A JP2006052944 A JP 2006052944A JP 2006052944 A JP2006052944 A JP 2006052944A JP 2006243729 A JP2006243729 A JP 2006243729A
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pixel
frame
overdrive
gradation value
value
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Ying-Hao Hsu
イン−ハオ,スー
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Chi Mei Optoelectronics Corp
チー メイ オプトエレクトロニクス コーポレーションChi Mei Optoelectronics Corporation
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611Control of matrices with row and column drivers
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0252Improving the response speed
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0261Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00Aspects of display data processing
    • G09G2340/16Determination of a pixel data signal depending on the signal applied in the previous frame

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for allowing appropriate overdrive. <P>SOLUTION: This method acquires an appropriate overdrive gradation value by selecting and referring to a static overdrive lookup table 435 or a dynamic overdrive lookup table 437 based on a pixel gradation value in a frame to be displayed next, a pixel gradation value in the preceding frame and a pixel gradation value in the frame prior to the preceding frame, whereby display quality of animation is effectively enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an overdrive device and an overdrive method.

FIG. 1A is a contrast diagram of a change in pixel gradation and a change in pixel luminance in a conventional liquid crystal display with a slow response of pixel luminance. As shown in FIG. 1A, when the pixel gradation value is switched from g 0 to g 1 at time t 0 , the luminance of the pixel also changes from Y 0 to Y 1 . However, since it takes too much time to change the actual luminance from Y 0 to Y 1 , the pixel luminance reaches Y 1 corresponding to the pixel gradation value g 1 within one frame period (t 1 -t 0 ). I can't.

Conventionally, in order to solve the problem that the response of the screen display of the liquid crystal display is too slow, an overdrive method is used to obtain the pixel gradation of the next display frame from the luminance of the pixel gradation of the display frame where the liquid crystal display is located. The response time required to switch to the brightness of the screen has been shortened. In the overdrive, as shown in FIG. 1B, in order to shorten the response time of the pixel luminance, the actual pixel gradation value is switched from g 0 to g 1 ′ with respect to the input pixel gradation value g 0 (g 1 ′> g 1 ). Thereby, the luminance of the pixel can reach Y 1 from Y 0 within time (t 1 -t 0 ). By driving with an overdrive gradation value that is higher or lower than the input pixel gradation value, the rotation of the liquid crystal is accelerated to reach the required pixel luminance. The overdrive tone value g 1 ′ is determined according to the pixel tone value g 1 in the next frame to be displayed and the pixel tone value g 0 in the previous frame (current frame).

  FIG. 2A is a block diagram illustrating a structure of a conventional liquid crystal display overdrive device. FIG. 2A takes a liquid crystal display with a resolution of I × J as an example. As shown in FIG. 2A, the overdrive device 200 includes a control unit 210, a frame memory 220, and an overdrive lookup unit 230. The control unit 210 inputs the pixel gradation value of each pixel in each frame. G (M + 1, i, j) indicates the pixel gradation value of the (i, j) -th pixel in the (M + 1) -th frame, that is, the next frame to be displayed. Here, 1 ≦ i ≦ I and 1 ≦ j ≦ J. G (M, i, j) indicates the pixel gradation value of the (i, j) -th pixel in the M-th frame, that is, the current frame. The frame memory 220 stores all pixel gradation values G (M, i, j) of the Mth frame. The overdrive lookup unit 230 outputs the pixel gradation value G (M + 1, i, j) of the (i, j) -th pixel in the (M + 1) -th frame to be displayed next and the previous M Based on the pixel gradation value G (M, i, j) of the (i, j) -th pixel in the ith frame, the overdrive lookup value 232 is referred to and the overdrive gradation value God (M + 1, i , J) are output to the liquid crystal display panel 240.

  As shown in FIG. 2B, the conventional overdrive lookup table 232 is a two-dimensional lookup table. The horizontal axis represents the gradation value G (M) of the Mth frame, and the vertical axis represents the gradation value G (M + 1) of the (M + 1) th frame. For example, in the case of 8 bits, the gradation values G (M) and G (M + 1) are each 0 to 255, and can take a total of 256 values. The overdrive tone value God (M + 1) of the pixel in the (M + 1) th frame is the tone value G (M + 1) of the (M + 1) th frame and the tone value G ( M) is determined with reference to the lookup table 232.

  The overdrive look-up table 232 is a static overdrive look-up table, and the overdrive tone value God (M + 1) includes the tone value G (M + 1) and the Mth of the (M + 1) th frame. Only the tone value G (M) of the frame is considered. The gradation value G (M−1) of the (M−1) th frame is based on the assumption that the gradation value G (M) of the Mth frame is equal. However, in practice, the gradation value G (M−1) of the (M−1) th frame is often different from the gradation value G (M). Refer to the static overdrive lookup table. However, the actually required overdrive gradation value God (M + 1) cannot be obtained.

As shown in FIG. 3A, according to the result of the experiment, the pixel gradation value before time t 0 is not constant at the value of g 0 , but is at the value of g 3 first, and from there to the value of g 0 . If the overdrive gradation value is g 1 ′, the pixel luminance directly changes from Y 0 to the target Y 1 when one frame period (t 1 -t 0 ) elapses. rather, after reaching once higher Y 2, gradually decreases up to Y 1 is a target. On the other hand, as shown in FIG. 3B, when the overdrive gradation value is g 1 ″ (g 1 ″ ≠ g 1 ′), the pixel luminance can be directly changed from Y 0 to the target Y 1. It becomes. From this, considering that the change in pixel gradation value is not simple, even if an overdrive gradation value is obtained using only the static lookup table described above, it is possible to effectively improve the quality of moving images. Have difficulty.
In view of the above problems, an object of the present invention is to provide a technique that enables appropriate overdrive.

  In the technique of the present invention, the static overdrive is performed based on the pixel gradation value in the next frame to be displayed, the pixel gradation value in the previous frame, and the pixel gradation value in the second previous frame. -Select a lookup table or a dynamic overdrive lookup table and refer to it to obtain an overdrive tone value. Thereby, the display quality of a moving image can be improved effectively.

  According to the technology of the present invention, an overdrive device that is used in a liquid crystal display panel and inputs a plurality of pixel gradation values in a plurality of frames of pixels and outputs an overdrive gradation value is provided. This overdrive device includes storage means and overdrive selection means. The storage means stores a pixel gradation value in each frame of pixels. The overdrive selection means is connected to the storage means, and the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed and the pixel level of the pixel in the frame immediately before the frame to be displayed next. Based on the comparison with the tone value, at least one overdrive lookup table to be used is selected, and further, the pixel tone value of the pixel in the next frame to be displayed and the pixel tone value of the pixel in the previous frame Based on the value, the overdrive tone value is output with reference to the selected overdrive lookup table.

  In this overdrive device, an appropriate overdrive is performed based on a comparison between the pixel gradation value in the frame immediately before the next frame to be displayed and the pixel gradation value in the frame immediately before the frame to be displayed next. Select a look-up table and determine the overdrive tone value using the selected overdrive look-up table. Thereby, the quality of the dynamic screen can be more effectively improved as compared with the conventional method using only the static overdrive lookup table.

  According to the technology of the present invention, another overdrive device that is used in a liquid crystal display panel and inputs a plurality of pixel gradation values in a plurality of frames of pixels and outputs an overdrive gradation value is provided. This overdrive device includes storage means and overdrive selection means. The storage means stores a pixel gradation value in each frame of pixels. The overdrive selection means is connected to the storage means, and the pixel gradation value of the pixel in the next frame to be displayed, the pixel gradation value of the pixel in the previous frame, and the pixel in the two previous frame Based on the pixel gradation value, at least one overdrive look-up table is referred to and an overdrive gradation value is output.

  The technology of the present invention also provides an overdrive method for inputting a pixel gradation value in each frame of pixels and outputting an overdrive gradation value to overdrive a liquid crystal display panel. In this overdrive method, a step of determining a difference between a pixel gradation value of a pixel in a frame immediately before a frame to be displayed next and a pixel gradation value of a pixel in a frame immediately before the frame to be displayed next. And at least one overdrive based on the determination result of the difference, the pixel gradation value of the pixel in the frame to be displayed next, and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next. Referring to a lookup table, and obtaining an overdrive tone value.

  The technique of the present invention also provides another overdrive method of inputting a pixel gradation value in each frame of pixels and outputting an overdrive gradation value to overdrive the liquid crystal display panel. In this overdrive method, the pixel gradation value of the pixel in the frame to be displayed next, the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next, and the pixel gradation value two before the frame to be displayed next are displayed. A step of acquiring an overdrive gradation value by referring to at least one overdrive lookup table based on a pixel gradation value of a pixel in the frame is provided.

  To make the above objects, features, and advantages of the present invention clearer and easier to understand, two preferred embodiments will be described below in detail with reference to the accompanying drawings.

(First embodiment)
FIG. 4A is a block diagram showing the structure of the overdrive device 400 according to the first embodiment of the present invention. Taking a liquid crystal display with a resolution of I × J as an example, the overdrive device 400 uses the pixel gradation value G (M + 1, i, j) of the (i, j) th pixel in the (M + 1) th frame. Then, the overdrive tone value God (M + 1, i, j) of the (i, j) th pixel in the (M + 1) th frame is output. Here, 1 ≦ i ≦ I and 1 ≦ j ≦ J. The overdrive device 400 includes a memory unit 420 and an overdrive selection unit 430.

  The memory unit 420 stores the gradation value G (M, i, j) of the (i, j) th pixel in the Mth frame. The memory unit 420 is, for example, a kind of frame memory, and stores pixel gradation values {G (M, i, j) | i = 1 to I, j = 1 to J} of all pixels in the Mth frame. . The overdrive selection unit 430 is connected to the memory unit 420, and the pixel gradation value G (M + 1, i, j) of the (i, j) th pixel in the next frame to be displayed and the previous one. Based on the pixel gradation value G (M, i, j) of the (i, j) th pixel in the frame, the overdrive lookup table is referred to, and the (i, j) th pixel in the next frame to be displayed The overdrive tone value God (M + 1, i, j) of the pixel is output.

As shown in FIG. 4A, the overdrive selection unit 430 includes a comparison unit 432, a dynamic recording unit 434, and a selection lookup unit 436.
The comparison unit 432 compares the pixel gradation value G (M + 1, i, j) in the next frame to be displayed with the pixel gradation value G (M, i, j) in the previous frame. A comparison result value D (M + 1, i, j) indicating the difference between the two is output. The comparison result value D (M + 1, i, j) is described by D + (M + 1, i, j) and D (M + 1, i, j). The dynamic recording unit 434 is connected between the comparison unit 432 and the selection lookup unit 436, and records the comparison result value D (M + 1, i, j) output from the comparison unit 432 and the previous recording. The comparison result value D (M, i, j) obtained from the previous frame and the previous frame is output.
The selection lookup unit 436 uses the pixel gradation value G (M + 1, i, j) in the next frame to be displayed and the pixel gradation value G (M, i, j) in the previous frame to The static overdrive tone value Gs (M + 1, i, j) is obtained with reference to the dynamic overdrive lookup table 435 and the dynamic overdrive floor with reference to the dynamic overdrive lookup table 437. An adjustment value Gd (M + 1, i, j) is acquired. Here, the static overdrive look-up table 435 is similar to the one illustrated in FIG. 2B, and the pixel gradation value G (M + 1, i, j) in the next frame to be displayed and the previous frame are displayed. Static overdrive tone values Gs (M + 1, i, j) are described in a two-dimensional map with pixel tone values G (M, i, j). The dynamic overdrive look-up table 437 also includes a pixel gradation value G (M + 1, i, j) in the next frame to be displayed and a pixel gradation value G (M, i, j) in the previous frame. The dynamic overdrive gradation value Gd (M + 1, i, j) is described in the two-dimensional map. The static overdrive lookup table 435 and the dynamic overdrive lookup table 437 have substantially the same data structure, but different overdrive gradation values are described. Next, the static overdrive tone value Gs (M + 1, i, j) or the dynamic overdrive tone value Gd (M + 1, i, j) is selected based on the comparison result value D (M, i, j). The overdrive tone value God (M + 1, i, j) is output to the liquid crystal display panel 440. Hereinafter, in order to describe the contents of the invention more concisely, the notation of (i, j) is omitted.

When the pixel gradation value G (M−1) of the previous frame is equal to the pixel gradation value G (M) of the previous frame, the comparison result value D + (M) is 0, and D (M) is 1. In this case, the selection lookup unit 436 selects the static overdrive lookup table 435 based on the comparison result value D (M) being 0, and by referring to this, the overdrive gradation value God is selected. (M + 1) is output. That is, since the pixel gradation values G (M−1) and G (M) of the previous two frames are in a stable state, an accurate overdrive level can be obtained only by using the static overdrive / lookup table 435. The adjustment value God (M + 1) can be obtained. On the other hand, when the pixel gradation value G (M−1) of the previous frame is different from the pixel gradation value G (M) of the previous frame, the comparison result value D + (M) is 1. , And D (M) is zero. In this case, the selection lookup unit 436 selects the dynamic overdrive lookup table 437 based on the comparison result value D (M) being 1, and refers to this to select the overdrive gradation. The value God (M + 1) is output. That is, since the pixel gradation values G (M−1) and G (M) of the previous two frames are in an unstable state (changed), the static overdrive lookup table 435 is accurate. It becomes impossible to obtain the overdrive tone value God (M + 1), and therefore the dynamic overdrive lookup table 437 is selected.

  FIG. 4B is a block diagram showing a structure of an overdrive device including an overdrive selection unit 430 that is a modified example based on the first embodiment of the present invention. The overdrive selection unit 430 includes a comparison unit 432, a dynamic recording unit 434, an overdrive lookup unit 431, and a selection correction unit 433. The comparison unit 432 compares the pixel gradation value G (M + 1) in the next frame to be displayed with the pixel gradation value G (M) in the previous frame, and outputs a comparison result value D (M + 1). . The dynamic recording unit 434 is connected between the comparison unit 432 and the selection correction unit 433. The dynamic recording unit 434 records the comparison result value D (M + 1) output from the comparison unit 432, and also records the previous frame recorded last time. And a comparison result value D (M) obtained from the previous two frames.

  The overdrive lookup unit 431 is a static overdrive lookup table based on the pixel gradation value G (M + 1) in the next frame to be displayed and the pixel gradation value G (M) in the previous frame. Referring to 438, the static overdrive gradation value Gs (M + 1) is output. The selection correction unit 433 is based on the comparison result value D (M) obtained from the previous frame and the second previous frame stored in the dynamic recording unit 434. With reference to the correction lookup table 439, gradation value correction is performed on the static overdrive gradation value Gs (M + 1). As a result, the necessary overdrive gradation value God (M + 1) is output.

  When the pixel gradation value G (M−1) of the previous frame is equal to the pixel gradation value G (M) of the previous frame, the comparison result value D (M) is 0. In this case, the selection correction unit 433 performs a logical operation based on the comparison result value D (M) being 0, and then converts the static overdrive gradation value Gs (M + 1) to the overdrive gradation value God. Output directly as (M + 1). That is, since the pixel gradation values G (M−1) and G (M) of the previous two frames are in a stable state, an accurate overdrive gradation can be obtained only by using the static overdrive / lookup table 438. The value God (M + 1) can be obtained. On the other hand, when the pixel gradation value G (M−1) of the previous frame is different from the pixel gradation value G (M) of the previous frame, the comparison result value D (M) is 1. . In this case, the selection correction unit 433 determines that the pixel gradation value G (M + 1) of the next frame to be displayed and the pixel gradation value of the previous frame based on the comparison result value D (M) being 1. Using G (M), the dynamic correction gradation value Gc (M + 1) is acquired by referring to the dynamic correction lookup table 439. Then, the static overdrive tone value Gs (M + 1) is corrected using the dynamic correction tone value Gc (M + 1), and the necessary overdrive tone value God (M + 1) is output. That is, God (M + 1) = Gs (M + 1) + D (M) × Gc (M + 1).

  In the above description, D (M) is 0 when G (M-1) and G (M) are equal, and D (M) is 1 when G (M-1) and G (M) are different. Become. However, when the absolute value | G (M−1) −G (M) | of the difference between G (M−1) and G (M) is less than a predetermined critical gradation difference x, D (M) becomes 0. , G (M−1) and G (M) D (M) is 1 when the absolute value | G (M−1) −G (M) | is equal to or greater than a predetermined critical gradation difference x. You may set as follows. The critical gradation difference x may be set and adjusted in consideration of the noise signal size and the like. For example, by setting a higher critical gradation difference as the noise signal becomes larger, it is possible to prevent the calculation result from being inappropriately affected by the noise signal. In the embodiment of driving 8-bit video material (pixel gradation value), the critical gradation difference is, for example, 8. In the embodiment of driving 6-bit video material (pixel gradation value), the critical gradation is The difference can be 2, for example.

FIG. 4C is a block diagram illustrating a structure of an overdrive device including an overdrive selection unit 430 according to another modified example based on the first embodiment. The overdrive selection unit 430 includes a comparison unit 432, a dynamic recording unit 434, and an overdrive lookup unit 450.
The comparison unit 432 compares the pixel gradation value G (M + 1) in the next frame to be displayed with the pixel gradation value G (M) in the previous frame, and shows a comparison result value D (M + 1) indicating the difference between the two. ) Is output. The dynamic recording unit 434 is connected between the comparison unit 432 and the overdrive lookup unit 450, and records the comparison result value D (M + 1) output by the comparison unit 432, and the previously recorded one A comparison result value D (M) obtained from the previous frame and the second previous frame is output.
The overdrive lookup unit 450 includes a comparison result value D (M) obtained from the previous frame and the previous frame, a pixel gradation value G (M + 1) in the next frame to be displayed, Based on the pixel gradation value G (M) in the previous frame, the overdrive gradation value God (M + 1) is output by referring to the three-dimensional overdrive lookup table 452.

  In this modification, the comparison result value D (M) obtained from the pixel gradation value G (M) of the previous frame and the pixel gradation value G (M−1) of the previous frame is 1 According to the gradation value difference (G (M) −G (M−1)) between the pixel gradation value G (M) of the previous frame and the pixel gradation value G (M−1) of the previous frame. Thus, the degree of difference between the two is numerically shown. For example, as shown in FIG. 4D, the gradation value section [−255, 255] is divided into five ranges. The first range is [−255, −128], and the corresponding value of D (M) is 1. The second range is [−128, −8], and the corresponding D (M) value is 2. The third gradation value range is set to [−8, 8], and the corresponding D (M) value is set to 0. The IV range is [8, 128], and the corresponding D (M) value is 3. The V range is [128, 255], and the corresponding D (M) value is 4.

FIG. 4E is a block diagram showing a structure of an overdrive device including an overdrive selection unit 430 which is still another modified example based on the first embodiment. The overdrive selection unit 430 includes a comparison unit 432, a dynamic recording unit 434, an overdrive lookup unit 460, and a selection correction unit 470.
The comparison unit 432 compares the pixel gradation value G (M + 1) of the next frame to be displayed with the pixel gradation value G (M) of the previous frame, thereby corresponding comparison result value D (M + 1). ) Is output.
The dynamic recording unit 434 is connected between the comparison unit 432 and the selection correction unit 470. The dynamic recording unit 434 records the comparison result value D (M + 1) output from the comparison unit 432, and also records the previous frame recorded last time. And a comparison result value D (M) obtained from the previous two frames.

  Based on the pixel gradation value G (M + 1) of the next frame to be displayed and the pixel gradation value G (M) of the previous frame, the overdrive lookup unit 460 is a static overdrive lookup table 462. , The static overdrive gradation value Gs (M + 1) is output. The selection correction unit 470 compares the comparison result value D (M) obtained from the previous frame and the previous frame, the pixel gradation value G (M + 1) in the next frame to be displayed, and the previous frame. The dynamic correction gradation value Gc (M + 1) is acquired by referring to the three-dimensional dynamic correction lookup table 472 on the basis of the pixel gradation value G (M) in the frame. Then, tone correction is performed on the static overdrive tone value Gs (M + 1) using the dynamic correction tone value Gc (M + 1), and an overdrive tone value God (M + 1) is output. Here, God (M + 1) = Gs (M + 1) + Gc (M + 1).

  As described above, the comparison result value D (M) obtained from the pixel gradation value G (M) in the previous frame and the pixel gradation value G (M−1) in the previous frame is 1 To the gradation value difference (G (M) −G (M−1)) between the pixel gradation value G (M) of the previous frame and the pixel gradation value G (M−1) of the previous frame. It is a numerical value generated by determining the corresponding gradation value range.

FIG. 5 is a flowchart of the overdrive method according to the first embodiment.
First, in step 500, a corresponding comparison is performed using the pixel gradation value G (M) of the frame immediately before the next frame to be displayed and the pixel gradation value G (M-1) of the frame immediately before the next frame to be displayed. The result value D (M) is obtained.
Next, in step 510, the comparison result value D (M) obtained from the previous frame and the second previous frame, the pixel gradation value G (M + 1) of the next frame to be displayed, and one of them. Based on the pixel gradation value G (M) of the previous frame, the overdrive gradation value God (M + 1) is obtained by referring to at least one overdrive lookup table. Thus, this flow ends.

FIG. 5A is a first detailed flowchart of the overdrive method of FIG. This first detailed flowchart shows the operation flow of the overdrive device 400 shown in FIG. 4A.
In step 500, using the pixel gradation value G (M) of the previous frame in the frame to be displayed next and the pixel gradation value G (M-1) of the previous frame, the corresponding comparison result value. D (M) is obtained. As described above, the absolute value of the difference between the pixel gradation value G (M) of the previous frame and the pixel gradation value G (M−1) of the previous frame is less than the critical gradation difference x. In this case, the comparison result value D + (M) becomes 0 and D (M) becomes 1. On the other hand, when the absolute value of the difference between the pixel gradation values G (M) and G (M−1) is greater than or equal to the critical gradation difference x, the comparison result value D + (M) becomes 1 and D (M) Becomes 0.
In step 512, by using the pixel gradation value G (M + 1) in the frame to be displayed next and the pixel gradation value G (M) in the previous frame, by referring to the static overdrive lookup table 435, The static overdrive tone value Gs (M + 1) is obtained.
In step 514, by using the pixel gradation value G (M + 1) in the next frame to be displayed and the pixel gradation value G (M) in the previous frame, by referring to the dynamic overdrive lookup table 437. The dynamic overdrive gradation value Gd (M + 1) is obtained.
In step 516, the comparison result value D + obtained from the previous frame and the previous frame, the static overdrive tone value Gs (M + 1), and the dynamic overdrive tone value Gd (M + 1). ) To obtain the overdrive tone value God (M + 1). Thus, this flow ends. Here, God (M + 1) = D - it is a (M) Gs (M + 1 ) + D + (M) Gd (M + 1).

FIG. 5B is a second detailed flowchart of the overdrive method of FIG. This second detailed flowchart shows the operation flow of the overdrive device shown in FIG. 4B.
In step 500, the corresponding comparison result value D is calculated from the pixel gradation value G (M) of the frame immediately before the next frame to be displayed and the pixel gradation value G (M-1) of the frame two frames before. Obtain (M). As described above, when the absolute value of the difference between the pixel gradation values G (M) and G (M−1) is less than the critical gradation difference x, the comparison result value D (M) is zero. On the other hand, when the absolute value of the difference between the pixel gradation values G (M) and G (M−1) is greater than or equal to the critical gradation difference x, the comparison result value D (M) is 1.
In step 518, the pixel gradation value G (M + 1) of the next frame to be displayed and the pixel gradation value G (M) of the previous frame are used to refer to the static overdrive lookup table 438 described above. As a result, a static overdrive gradation value Gs (M + 1) is obtained.
In step 520, by referring to the dynamic correction lookup table 439 based on the pixel gradation value G (M + 1) in the frame to be displayed next and the pixel gradation value G (M) in the previous frame, A dynamic correction gradation value Gc (M + 1) is obtained.
In step 522, the comparison result value D (M) obtained from the previous frame and the previous frame, the static overdrive tone value Gs (M + 1), and the dynamic correction tone value Gc ( M + 1) is used to obtain the overdrive tone value God (M + 1). Thus, this flow ends. Here, God (M + 1) = Gs (M + 1) + D (M) Gc (M + 1).

FIG. 5C is a third detailed flowchart of the overdrive method of FIG. This third detailed flowchart shows the operation flow of the overdrive device shown in FIG. 4C.
In step 502, a gradation value difference ((M−1) in the frame immediately before the next frame to be displayed and the pixel gradation value G (M−1) in the frame two frames before the next display are used. G (M) -G (M-1)) is obtained.
In step 504, the comparison result value D (M) is obtained by determining the range of the corresponding gradation value based on the gradation value difference (G (M) -G (M-1)). As shown in FIG. 4D, based on the gradation value range I to V corresponding to the gradation difference value (G (M) −G (M−1)), the corresponding comparison result value D (M) = 1. Obtain 2, 0, 3, 4.
In step 524, the comparison result value D (M) obtained from the previous frame and the previous frame, the pixel gradation value G (M + 1) in the next frame to be displayed, and the previous frame The overdrive tone value God (M + 1) is obtained by using the pixel tone value G (M) at, and referring to the three-dimensional overdrive / lookup table 452. Thus, this flow ends.

FIG. 5D is a fourth detailed flowchart of the overdrive method of FIG. This fourth detailed flowchart shows the operation flow of the overdrive device shown in FIG. 4E.
In step 502, using the pixel gradation value G (M) in the frame immediately before the next frame to be displayed and the pixel gradation value G (M−1) in the frame immediately before the next frame, the gradation value difference is determined. (G (M) -G (M-1)) is obtained.
In step 504, the comparison result value D (M) is obtained by determining the range of the corresponding gradation value based on the gradation value difference (G (M) -G (M-1)). As shown in FIG. 4D, based on the gradation value range I to V corresponding to the gradation difference value (G (M) −G (M−1)), the corresponding comparison result value D (M) = 1. Obtain 2, 0, 3, 4.
In step 526, the static overdrive lookup table 462 is referred to using the pixel gradation value G (M + 1) in the next frame to be displayed and the pixel gradation value G (M) in the previous frame. As a result, the static overdrive gradation value Gs (M + 1) is obtained.
In step 528, the comparison result value D (M) obtained from the previous frame and the previous frame, the pixel gradation value G (M + 1) in the next frame to be displayed, and the previous one Based on the pixel gradation value G (M) in the frame, the dynamic correction gradation value Gc (M + 1) is obtained by referring to the three-dimensional dynamic correction lookup table 472.
In step 530, the overdrive tone value God (M + 1) is obtained by calculating the sum of the static overdrive tone value Gs (M + 1) and the dynamic correction tone value Gc (M + 1). Here, when the absolute value of the difference between the pixel gradation value G (M) and the pixel gradation value G (M−1) is less than the critical gradation value x, the dynamic correction gradation value Gc (M + 1) Becomes 0. Thus, this flow ends.

(Second Embodiment)
FIG. 6A is a block diagram showing a structure of an overdrive device 600 according to the second embodiment of the present invention. Taking a liquid crystal display with a resolution of I × J as an example, the overdrive device 600 uses the pixel gradation value G (M + 1, i, j) of the (i, j) th pixel in the (M + 1) th frame. Then, the overdrive tone value God (M + 1, i, j) of the (i, j) th pixel in the (M + 1) th frame is output. Here, 1 ≦ i ≦ I and 1 ≦ j ≦ J.
The overdrive device 600 includes a memory unit 620 and an overdrive lookup unit 630. The memory unit 620 stores the pixel gradation value G (M + 1, i, j) of the (i, j) th pixel in the (M + 1) th frame. The pixel gradation values {G (M, i, j) | i = 1 to I, j = 1 to J} of the Mth frame are stored in the frame memory 622. On the other hand, the (M−1) th frame is stored in another frame memory 624. Hereinafter, in order to describe the contents of the invention more concisely, the notation of (i, j) is omitted.

  The overdrive lookup unit 630 is connected to the memory unit 620, and the pixel gradation value G (M + 1) of the next frame to be displayed, for example, the (M + 1) th frame, and the pixels in the previous frame Based on the gradation value G (M) and the pixel gradation value G (M−1) of the previous two frames, the overdrive gradation value God ( M + 1) is output to the liquid crystal display panel 640.

  As shown in FIG. 6B, taking 8 bits as an example, the three-dimensional overdrive lookup table 632 includes 256 G (M−1) values (0 to 255) on the X axis and Y axis. It is composed of 256 G (M) values (0-255) and Z G-axis 256 G (M + 1) values (0-255). Each coordinate point (x, y, z) has a pixel gradation value G (M + 1) in the frame to be displayed next, a pixel gradation value G (M) in the previous frame, and two In the case of the pixel gradation value G (M−1) of the previous frame, a necessary overdrive gradation value is described.

  As shown in FIG. 6C, the overdrive lookup unit 630 may include a static overdrive unit 634 and a dynamic correction unit 636. The static overdrive unit 634 stores the static overdrive lookup table 635 based on the pixel gradation value G (M + 1) of the next frame to be displayed and the pixel gradation value G (M) of the previous frame. By referring to, the static overdrive gradation value Gs (M + 1) is output. The dynamic correction unit 636 includes the pixel gradation value G (M + 1) of the next frame to be displayed, the pixel gradation value G (M) of the previous frame, and the pixel gradation value of the previous frame. Based on G (M−1), the dynamic correction gradation value Gc (M + 1) is obtained by referring to the three-dimensional dynamic correction lookup table 637 and the static overdrive gradation value Gs (M + 1) is corrected. The necessary overdrive gradation value God (M + 1) (= Gs (M + 1) + Gc (M + 1)) is output. Here, the three-dimensional dynamic correction lookup table 637 is similar to the above-described three-dimensional overdrive lookup table 632 except that each coordinate point (x, In y, z), the pixel gradation value in the next frame to be displayed is G (M + 1), the pixel gradation value in the previous frame is G (M), and This is a point describing the required correction amount of the static overdrive gradation value Gs (M + 1) when the pixel gradation value is G (M−1).

FIG. 6D is a flowchart of the overdrive method according to the second embodiment. In step 600, the pixel gradation value G (M + 1) of the next frame to be displayed, the pixel gradation value G (M) of the previous frame, and the pixel gradation value G (M of the previous frame). The necessary overdrive tone value God (M + 1) is obtained by directly referring to the three-dimensional overdrive lookup table 632 based on −1). This flow is completed by the above.
FIG. 6E shows another overdrive method according to the second embodiment. The flow shown in FIG. 6E shows the operation flow of the overdrive device shown in FIG. 6C.
In step 610, the static overdrive lookup table 635 is referred to based on the pixel gradation value G (M + 1) in the next frame to be displayed and the pixel gradation value G (M) in the previous frame. As a result, the static overdrive gradation value Gs (M + 1) is obtained.
In step 620, the pixel gradation value G (M + 1) in the next frame to be displayed, the pixel gradation value G (M) in the previous frame, and the pixel gradation value G (M in the previous frame). Based on (-1), the dynamic correction gradation value Gc (M + 1) is obtained by referring to the three-dimensional dynamic correction lookup table 637.
In step 630, the sum of the static overdrive tone value Gs (M + 1) and the dynamic correction tone value Gc (M + 1) is calculated to obtain the corresponding overdrive tone value God (M + 1).

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

FIG. 10 is a contrast diagram of pixel gradation change and pixel brightness change in a conventional liquid crystal display having a slow pixel brightness response. FIG. 10 is a contrast diagram of a change in pixel gradation and a change in pixel luminance when the pixel luminance response time is shortened by a conventional overdrive method. It is a structure block diagram of the conventional overdrive device of a liquid crystal display. It is the schematic of the conventional overdrive look-up table. FIG. 10 is a contrast diagram of a change in pixel gradation and a change in pixel luminance when the static overdrive method is used when the pixel gradation values of the immediately preceding two frames are different. FIG. 10 is a contrast diagram of a pixel gradation change and a pixel brightness change when a better pixel brightness change is obtained using a new overdrive tone value when the pixel tone values of two immediately preceding frames are different. 1 is a structural block diagram of one overdrive device based on a first embodiment of the present invention. FIG. It is a structural block diagram of the overdrive device provided with the overdrive selection unit of the modification based on 1st Embodiment of this invention. It is a structural block diagram of the overdrive device provided with the overdrive selection unit of the modification based on 1st Embodiment of this invention. FIG. 6 is a schematic diagram showing that the difference in pixel gradation value between the previous frame and the second previous frame is divided into five gradation value ranges based on the first embodiment of the present invention; It is. It is a structural block diagram of the overdrive device provided with the overdrive selection unit of the modification based on 1st Embodiment of this invention. 3 is a flowchart of an overdrive method according to the first embodiment of the present invention. 6 is a first detailed flowchart of the overdrive method of FIG. 5. 6 is a second detailed flowchart of the overdrive method of FIG. 5. 6 is a third detailed flowchart of the overdrive method of FIG. 5. 6 is a fourth detailed flowchart of the overdrive method of FIG. 5. It is a structural block diagram of the overdrive device based on 2nd Embodiment of this invention. It is the schematic of a three-dimensional overdrive look-up table. It is a structural block diagram of the overdrive device of the modification based on 2nd Embodiment of this invention. 4 is a flowchart of an overdrive method according to a second embodiment of the present invention. It is a flowchart of the overdrive method of the modification based on 2nd Embodiment of this invention.

Explanation of symbols

200, 400, 600: Overdrive device 210: Control unit 220, 622, 624: Frame memory 230, 431, 450, 460, 630: Overdrive lookup unit 232: Overdrive lookup table 240, 440, 640 : Liquid crystal display panel 420, 620: Memory unit 430: Overdrive selection unit 432: Comparison unit 433, 470: Selection correction unit 434: Dynamic recording unit 435, 438, 462, 635: Static overdrive lookup table 436 : Selection lookup unit 437: Dynamic overdrive lookup table 439: Dynamic correction lookup table 452, 632: Three-dimensional overdrive lookup table 34: Static overdrive unit 636: dynamic correction unit 472,637: 3d dynamic correction lookup table

Claims (27)

  1. An overdrive device that is used in a liquid crystal display panel, inputs a plurality of pixel gradation values in a plurality of pixels frames, and outputs an overdrive gradation value,
    Storage means for storing the plurality of pixel gradation values;
    A pixel gradation value of the pixel in a frame immediately before the next frame to be displayed; and a pixel gradation value of the pixel in a frame immediately before the frame to be displayed next; Based on the difference, at least one overdrive lookup table is selected, and the pixel gradation value of the pixel in the next frame to be displayed and the pixel gradation value of the pixel in the previous frame are selected. Overdrive selection means for outputting an overdrive gradation value with reference to the selected overdrive lookup table,
    An overdrive device comprising:
  2. The overdrive selecting means is
    Next, the pixel gradation value of the pixel in the frame to be displayed is sequentially input, compared with the pixel gradation value of the pixel in the immediately preceding frame, and a comparison result value describing the difference between the two is obtained. A comparison means for sequentially outputting;
    The comparison means is connected to record the comparison result value obtained from the next frame to be displayed and the previous frame, and the previous frame and the second previous frame to be displayed next. Dynamic recording means for outputting the comparison result value obtained from the frame;
    Connected to the dynamic recording means, and based on the pixel gradation value in the next frame to be displayed and the pixel gradation value in the frame immediately before the next frame to be displayed, a static overdrive lookup is performed. The static overdrive tone value is obtained with reference to the table, and the dynamic overdrive tone value is obtained with reference to the dynamic overdrive lookup table, and the previous frame and the previous frame are obtained. Selection means for selecting one of the obtained static overdrive tone value and dynamic overdrive tone value based on the comparison result value obtained from the output and outputting the overdrive tone value The overdrive device according to claim 1, further comprising:
  3.   The selection look-up means, when the comparison result value indicates that the pixel gradation value in the second previous frame and the pixel gradation value in the previous frame are equal, 3. The overdrive device according to claim 2, wherein a drive gradation value is selected and output.
  4.   The selection look-up means, when the comparison result value indicates that the pixel gradation value in the second previous frame is different from the pixel gradation value in the previous frame, 4. The overdrive device according to claim 2, wherein a drive gradation value is selected and output.
  5. The overdrive selecting means is
    Next, the pixel gradation value of the pixel in the frame to be displayed is sequentially input, compared with the pixel gradation value of the pixel in the immediately preceding frame, and a comparison result value describing the difference between the two is obtained. A comparison means for sequentially outputting;
    The comparison means is connected to record the comparison result value obtained from the next frame to be displayed and the previous frame, and the previous frame and the second previous frame to be displayed next. Dynamic recording means for outputting the comparison result value obtained from the frame;
    Based on the pixel gradation value of the pixel in the next frame to be displayed and the pixel gradation value of the pixel in the previous frame, the static overdrive lookup table is referred to An overdrive lookup means for outputting a tone value;
    Based on the comparison result value obtained from the previous frame and the second previous frame connected to the dynamic recording means, and the dynamic correction lookup table, 2. The overdrive device according to claim 1, further comprising selection correction means for correcting the static overdrive gradation value and outputting the overdrive gradation value.
  6.   The selection correction means, when the comparison result value indicates that a pixel gradation value in the second previous frame is equal to a pixel gradation value in the previous frame, the static overdrive 6. The overdrive device according to claim 5, wherein the gradation value is output without correction.
  7.   The selection correction means, when the comparison result value indicates that the pixel gradation value in the second previous frame is different from the pixel gradation value in the previous frame, a frame to be displayed next The dynamic correction gradation value is obtained from the dynamic correction lookup table using the pixel gradation value of the pixel and the pixel gradation value of the pixel in the previous frame, and the acquired dynamic correction level 7. The overdrive device according to claim 5, wherein the static overdrive gradation value is corrected using a tone value.
  8. The overdrive selecting means is
    Next, the pixel gradation value of the pixel in the frame to be displayed is sequentially input, compared with the pixel gradation value of the pixel in the immediately preceding frame, and a comparison result value describing the difference between the two is obtained. A comparison means for sequentially outputting;
    The comparison means is connected to record the comparison result value obtained from the next frame to be displayed and the previous frame, and the previous frame and the second previous frame to be displayed next. Dynamic recording means for outputting the comparison result value obtained from the frame;
    Connected to the dynamic recording means, the comparison result value obtained from the previous frame and the previous frame, the pixel gradation value of the pixel in the frame to be displayed next, and the first Three-dimensional overdrive lookup means for outputting the overdrive gradation value by referring to a three-dimensional overdrive lookup table based on the pixel gradation value of the pixel in the previous frame. The overdrive device according to claim 1.
  9. The overdrive selecting means is
    Next, the pixel gradation value of the pixel in the frame to be displayed is sequentially input, compared with the pixel gradation value of the pixel in the immediately preceding frame, and a comparison result value describing the difference between the two is obtained. A comparison means for sequentially outputting;
    The comparison means is connected to record the comparison result value obtained from the next frame to be displayed and the previous frame, and the previous frame and the second previous frame to be displayed next. Dynamic recording means for outputting the comparison result value obtained from the frame;
    Based on the pixel gradation value of the pixel in the next frame to be displayed and the pixel gradation value of the pixel in the previous frame, the static overdrive lookup table is referred to An overdrive lookup means for outputting a tone value;
    Connected to the dynamic recording means, the comparison result value obtained from the previous frame and the previous frame, the pixel gradation value of the pixel in the frame to be displayed next, and the first Based on the pixel gradation value of the pixel in the previous frame, a dynamic correction gradation value is obtained by referring to a three-dimensional dynamic correction lookup table, and the acquired dynamic correction gradation value is used to obtain the dynamic correction gradation value. The overdrive device according to claim 1, further comprising: a three-dimensional selection correction unit that corrects a static overdrive tone value and outputs the overdrive tone value.
  10.   The comparison unit is configured such that a difference between a pixel gradation value of the pixel in a frame to be displayed next and a pixel gradation value of the pixel in a frame immediately before the frame to be displayed next is set in advance. The overdrive device according to any one of claims 2 to 9, wherein it is determined which of the two ranges originally exists, and a comparison result value corresponding to the determined range is output.
  11. An overdrive device that is used in a liquid crystal display panel, inputs a plurality of pixel gradation values in a plurality of pixels frames, and outputs an overdrive gradation value,
    Storage means for storing the plurality of pixel gradation values;
    The pixel gradation value of the pixel in the frame to be displayed next, the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next, and the frame to be displayed next are connected to the storage means Overdrive lookup means for referring to at least one overdrive lookup table and outputting an overdrive tone value based on the pixel tone value of the pixel in the two previous frames;
    An overdrive device comprising:
  12.   The overdrive lookup means includes a pixel gradation value of the pixel in a frame to be displayed next, a pixel gradation value of the pixel in a frame immediately before the frame to be displayed next, and a frame to be displayed next. 12. The overdrive according to claim 11, wherein the overdrive tone value is output with reference to a three-dimensional overdrive look-up table based on a pixel tone value of the pixel in the second previous frame. apparatus.
  13. The overdrive lookup means comprises:
    Based on the pixel gradation value of the pixel in the next frame to be displayed and the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed, refer to the static overdrive lookup table. Static overdrive means for outputting static overdrive gradation values;
    The pixel gradation value of the pixel in the frame to be displayed next, the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next, and the pixel in the frame immediately before the frame to be displayed next A dynamic correction gradation value is obtained by referring to a three-dimensional dynamic correction lookup table, and the static overdrive gradation value is determined using the acquired dynamic correction gradation value. The overdrive device according to claim 11, further comprising dynamic correction means that corrects and outputs the overdrive gradation value.
  14. An overdrive method used in a liquid crystal display panel to obtain an overdrive gradation value based on a pixel gradation value of a pixel in a frame to be displayed next,
    (A) The pixel gradation value of the pixel in the frame immediately before the next frame to be displayed and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next are compared with each other. A first step of obtaining a result value;
    (B) The comparison result value obtained from the previous frame and the previous frame, the pixel gradation value of the pixel in the next frame to be displayed, and the previous frame to be displayed next A second step of obtaining the overdrive tone value based on a pixel tone value of the pixel with reference to at least one overdrive lookup table;
    An overdrive method comprising:
  15. The second step (b)
    (B-1) A static overdrive lookup table using the pixel gradation value of the pixel in the frame to be displayed next and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next Obtaining a static overdrive tone value with reference to
    (B-2) A dynamic overdrive lookup table using the pixel gradation value of the pixel in the frame to be displayed next and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next Obtaining a dynamic overdrive tone value with reference to
    (B-3) Using the comparison result value obtained from the previous frame and the previous frame, the static overdrive tone value, and the dynamic overdrive tone value, The method according to claim 14, further comprising: obtaining an overdrive gradation value.
  16.   The absolute value of the difference between the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed and the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed is less than a predetermined value. 16. The overdrive method according to claim 15, wherein the static overdrive gradation value is the overdrive gradation value.
  17.   The absolute value of the difference between the pixel tone value of the pixel in the frame immediately before the next frame to be displayed and the pixel tone value of the pixel in the frame immediately before the next frame to be displayed is a predetermined value or more. 17. The overdrive method according to claim 15 or 16, wherein the dynamic overdrive gradation value is the overdrive gradation value.
  18. The second step (b)
    (B-1) A static overdrive lookup table using the pixel gradation value of the pixel in the frame to be displayed next and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next Obtaining a static overdrive tone value with reference to
    (B-2) Refer to the dynamic correction lookup table using the pixel gradation value of the pixel in the frame to be displayed next and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next And obtaining a dynamic correction gradation value;
    (B-3) Using the comparison result value obtained from the previous frame and the previous frame, the static overdrive tone value, and the dynamic correction tone value, The method of claim 14, further comprising: obtaining a drive gradation value.
  19.   The absolute value of the difference between the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed and the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed is less than a predetermined value. 19. The overdrive method according to claim 18, wherein the static overdrive gradation value is the overdrive gradation value.
  20.   The absolute value of the difference between the pixel tone value of the pixel in the frame immediately before the next frame to be displayed and the pixel tone value of the pixel in the frame immediately before the next frame to be displayed is a predetermined value or more. 20. The overdrive method according to claim 18, wherein the overdrive tone value is a sum of the static overdrive tone value and the dynamic correction tone value.
  21. The first step (a)
    (A-1) The gradation value of the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next Obtaining a difference;
    The overdrive method according to claim 14, further comprising: (a-2) obtaining the comparison result value by determining a gradation value range corresponding to the gradation value difference.
  22. The second step (b)
    (B-1) The comparison result value obtained from the previous frame and the previous frame, the pixel gradation value of the pixel in the frame to be displayed next, and one of the frames to be displayed next The method of claim 21, further comprising: obtaining the overdrive tone value using a pixel tone value of the pixel in a previous frame and referring to a three-dimensional overdrive look-up table. Method.
  23. The second step (b)
    (B-1) A static overdrive lookup table using the pixel gradation value of the pixel in the frame to be displayed next and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next Obtaining a static overdrive tone value with reference to
    (B-2) The comparison result value obtained from the previous frame and the previous frame, the pixel gradation value of the pixel in the frame to be displayed next, and one of the frames to be displayed next Obtaining a dynamic correction tone value with reference to a three-dimensional dynamic correction lookup table based on the pixel tone value of the pixel in the previous frame;
    And (b-3) obtaining the overdrive gradation value by calculating a sum of the static overdrive gradation value and the dynamic correction gradation value. 21 overdrive methods.
  24.   The absolute value of the difference between the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed and the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed is less than a predetermined value. 24. The overdrive method according to claim 23, wherein the dynamic correction gradation value is set to zero.
  25. An overdrive method used in a liquid crystal display panel to obtain an overdrive gradation value based on a pixel gradation value of a pixel in a frame to be displayed next,
    (A) The pixel gradation value of the pixel in the frame to be displayed next, the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next, and the frame two frames before the frame to be displayed next Obtaining an overdrive tone value by referring to at least one overdrive lookup table based on the pixel tone value of the pixel in
    An overdrive method comprising:
  26.   In step (a), the pixel gradation value of the pixel in the frame to be displayed next, the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next, and 2 of the frame to be displayed next 26. The overdrive method according to claim 25, wherein the overdrive gradation value is output with reference to a three-dimensional overdrive lookup table based on a pixel gradation value of the pixel in the previous frame.
  27. Step (a)
    (A-1) A static overdrive lookup table based on the pixel gradation value of the pixel in the next frame to be displayed and the pixel gradation value of the pixel in the frame immediately before the frame to be displayed next Obtaining a static overdrive tone value with reference to
    (A-2) The pixel gradation value of the pixel in the next frame to be displayed, the pixel gradation value of the pixel in the frame immediately before the next frame to be displayed, and two frames before the frame to be displayed next Obtaining a dynamic correction gradation value by referring to a three-dimensional dynamic correction lookup table based on the pixel gradation value of the pixel in the frame of
    (A-3) obtaining the overdrive tone value by calculating the sum of the static overdrive tone value and the dynamic correction tone value;
    The overdrive method according to claim 25.
JP2006052944A 2005-03-02 2006-02-28 Overdrive system and overdrive method Pending JP2006243729A (en)

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